Plastic lens assembly, imaging lens module and electronic device

ABSTRACT

A plastic lens assembly includes at least two plastic lens elements and at least one cementing glue coating. The plastic lens elements include a first plastic lens element and a second plastic lens element. The first plastic lens element has a first optical effective portion and a first peripheral portion, wherein the first peripheral portion surrounds the first optical effective portion. The second plastic lens element has a second optical effective portion and a second peripheral portion, wherein the second peripheral portion surrounds the second optical effective portion. The cementing glue coating is disposed between the first optical effective portion and the second optical effective portion, and for cementing the first plastic lens element and the second plastic lens element, wherein at least one optical gap is formed between the first optical effective portion and the second optical effective portion.

RELATED APPLICATIONS

This application claims priority to Taiwan Application Serial Number107141532, filed Nov. 21, 2018, which is herein incorporated byreference.

BACKGROUND Technical Field

The present disclosure relates to a plastic lens assembly and an imaginglens module. More particularly, the present disclosure relates to aplastic lens assembly and an imaging lens module applicable to portableelectronic devices.

Description of Related Art

In recent years, portable electronic devices have developed rapidly. Forexample, intelligent electronic devices and tablets have been filled inthe lives of modern people, and camera module mounted on portableelectronic devices has also prospered. However, as technology advances,the quality requirements of camera modules are becoming higher andhigher. Therefore, in addition to the improvement in optical design, thecamera module needs to be improved in manufacturing precision.

SUMMARY

According to one aspect of the present disclosure, a plastic lensassembly includes at least two plastic lens elements and at least onecementing glue coating. The at least two plastic lens elements include afirst plastic lens element and a second plastic lens element. The firstplastic lens element has a first optical effective portion and a firstperipheral portion, wherein the first peripheral portion surrounds thefirst optical effective portion. The second plastic lens element has asecond optical effective portion and a second peripheral portion,wherein the second peripheral portion surrounds the second opticaleffective portion. The at least one cementing glue coating is disposedbetween the first optical effective portion and the second opticaleffective portion, and for cementing the first plastic lens element andthe second plastic lens element, wherein at least one optical gap isformed between the first optical effective portion and the secondoptical effective portion. The cementing glue coating is farther from acenter of the first optical effective portion than the optical gap istherefrom. When a refractive index of the optical gap is Na, and arefractive index of the cementing glue coating is Ng, the followingcondition is satisfied:0.52<Na/Ng<1.0.

According to another aspect of the present disclosure, an imaging lensmodule includes the plastic lens assembly of the aforementioned aspect.

According to further another aspect of the present disclosure, anelectronic device includes the imaging lens module of the aforementionedaspect.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure can be more fully understood by reading thefollowing detailed description of the embodiment, with reference made tothe accompanying drawings as follows:

FIG. 1A is a schematic view of an imaging lens module according to the1st embodiment of the present disclosure.

FIG. 1B is a schematic view of the parameters of the imaging lens moduleaccording to the 1st embodiment in FIG. 1A.

FIG. 10 is another schematic view of the parameters of the imaging lensmodule according to the 1st embodiment in FIG. 1A.

FIG. 2A is a schematic view of an imaging lens module according to the2nd embodiment of the present disclosure.

FIG. 2B is a schematic view of the parameters of the imaging lens moduleaccording to the 2nd embodiment in FIG. 2A.

FIG. 2C is another schematic view of the parameters of the imaging lensmodule according to the 2nd embodiment in FIG. 2A.

FIG. 3A is a schematic view of an imaging lens module according to the3rd embodiment of the present disclosure.

FIG. 3B is a schematic view of the parameter of the imaging lens moduleaccording to the 3rd embodiment in FIG. 3A.

FIG. 3C is another schematic view of the parameter of the imaging lensmodule according to the 3rd embodiment in FIG. 3A.

FIG. 4A is a schematic view of an electronic device according to the 4thembodiment of the present disclosure.

FIG. 4B is another schematic view of the electronic device of the 4thembodiment.

FIG. 4C is a block diagram of the electronic device of the 4thembodiment.

FIG. 5 is a schematic view of an electronic device according to the 5thembodiment of the present disclosure.

FIG. 6 is a schematic view of an electronic device according to the 6thembodiment of the present disclosure.

DETAILED DESCRIPTION

The present disclosure provides a plastic lens assembly, including atleast two plastic lens elements and at least one cementing glue coating.The at least two plastic lens elements include a first plastic lenselement and a second plastic lens element. The first plastic lenselement has a first optical effective portion and a first peripheralportion, wherein the first peripheral portion surrounds the firstoptical effective portion. The second plastic lens element has a secondoptical effective portion and a second peripheral portion, wherein thesecond peripheral portion surrounds the second optical effectiveportion. The cementing glue coating is disposed between the firstoptical effective portion and the second optical effective portion, andfor cementing the first plastic lens element and the second plastic lenselement, wherein at least one optical gap is formed between the firstoptical effective portion and the second optical effective portion. Thecementing glue coating is farther from a center of the first opticaleffective portion than the optical gap is therefrom. When a refractiveindex of the optical gap is Na, and a refractive index of the cementingglue coating is Ng, the following condition is satisfied:0.52<Na/Ng<1.0. By forming the optical gap at the center of the opticaleffective portion between the two plastic lens elements, and arrangingthe cementing glue coating at the position of the effective opticalportion close to the peripheral region thereof and the refractive indexof the optical gap smaller than the refractive index of the cementingglue coating, the imaging light from the farther field of view can passthrough the medium having higher refractive index and the imaging lightcloser to the center field of view can pass through the medium havinglower refractive index. Thus, the converging situation of the imaginglight from the farther field of view can be adjusted independentlywithout affecting the light gathering quality of the central field ofview, which is favorable for adjusting the light gathering resolution ofthe specific field of view of the plastic lens assembly.

When the refractive index of the optical gap is Na, and the refractiveindex of the cementing glue coating is Ng, the following condition issatisfied: 0.56<Na/Ng<0.80. Therefore, it is favorable for furthercorrecting the imaging light from the farther field of view by moresignificant ratio configuration between the optical gap and thecementing glue coating, so as to obtain the expected light gatheringquality.

The aforementioned optical gap can be an air gap. Therefore, therefractive index between the different field of view can be adjustedonly by using the cementing glue coating (such as the material of gluelayer) without additional optical material.

When a width of the optical gap close to a central axis of the plasticlens assembly is d, and a maximum width of the optical gap close to thecementing glue coating is ET, the following condition is satisfied:0<ET/d<0.90. Because the optical gap has uneven thickness, by theaforementioned arrangement which is favorable for gathering the imaginglight, and the wider part close to the central axis is favorable foravoiding the cementing glue coating from being close to the center ofthe lens element. Moreover, the following condition is satisfied:0<ET/d<0.40. Therefore, it is favorable for effectively controlling thecementing glue coating to flow toward the direction away from the centerof the lens element by maintaining the significant width proportion.

When a central thickness of the cementing glue coating is ETM, thefollowing condition is satisfied: 0.02 mm<ETM<0.12 mm. Therefore, it isfavorable for avoiding an internal stress inside of the cementing gluecoating which is generated during a drying process from pulling the lenselement by maintaining thin thickness of the cementing glue coating, soas to decrease redundant stress which is left over and avoid the airbubble from accumulating therein.

When the refractive index of the optical gap is Na, the refractive indexof the cementing glue coating is Ng, and a refractive index of the firstplastic lens element is N1, the following condition is satisfied:Na/Ng<Na<N1/Na. Therefore, it is favorable for reducing the flare fromsurface reflection between the first plastic lens element and the secondplastic lens element by arranging the refractive index of the firstplastic lens element larger than the refractive index of the cementingglue coating. It should be mentioned that the refractive index of theoptical gap Na can be 1.

When a maximum width of the cementing glue coating farthest from theoptical gap is ETT, and the central width of the cementing glue coatingis ETM, the following condition is satisfied: 0.1<ETT/ETM<1.5.Therefore, the thickness of the middle area of the cementing gluecoating would not be too thin, so that the material of the cementingglue coating would not overflow from the plastic lens element easilywhich would generate the defect of insufficient filling in an areaexpected to be filled with the material of the cementing glue coating.

When the maximum width of the optical gap close to the cementing gluecoating is ET, and the central width of the cementing glue coating isETM, the following condition is satisfied: 0.1<ET/ETM<1.5. Therefore,the middle area of the cementing glue coating can be fuller which isfavorable for avoiding the material of the cementing glue coatingflowing toward the optical gap. Moreover, the following condition issatisfied: 0.1<ET/ETM<1.0. Hence, it is favorable for reducing the airbubbles accumulating in the cementing glue coating by arranging thebetter width proportion.

The optical gap can be gradually reduced from a position close to acenter region thereof to a peripheral region thereof. Accordingly, thenarrow opening design of the optical gap can be provided to avoid theinternal reflection.

Both of two surfaces of the cementing glue coating can be aspheric.Therefore, the light gathering quality of the imaging light can beadjusted so as to improve the situation of the image curvatureeffectively.

Both of two surfaces of the optical gap can be aspheric. Therefore, theinflection point can be arranged on the plastic lens element by theaspheric characteristic of the optical gap so as to improve off-axisaberration.

When a vertical distance between a position of the optical gap farthestfrom the central axis and the central axis is Yet, and a maximum radiusof the optical effective portion of the first plastic lens elementfacing to the cementing glue coating is Y12, the following condition issatisfied: Yet/Y12<0.95. Therefore, it is favorable for improving theimage curvature without affecting the light from near field of view byletting little part of the imaging light from the farther field of viewpasses through the cementing glue coating. Moreover, the followingcondition is satisfied: Yet/Y12<0.85. Therefore, most of imaging lightfrom far field of view can pass through the cementing glue coating,which can be further adjusted by the arrangement of the refractive indexof the cementing glue coating larger than the refractive index of theoptical gap.

When a vertical distance between a position of the optical gap farthestfrom the central axis and the central axis is Yet, and a maximum radiusof the optical effective portion of the second plastic lens elementfacing to the cementing glue coating is Y21, the following condition issatisfied: Yet/Y21<0.95. Therefore, it is favorable for improving theimage curvature without affecting the light from near field of view byletting little part of the imaging light from the farther field of viewpasses through the cementing glue coating. Moreover, the followingcondition is satisfied: Yet/Y21<0.85. Therefore, most of imaging lightfrom far field of view can pass through the cementing glue coating,which can be further adjusted by the arrangement of the refractive indexof the cementing glue coating larger than the refractive index of theoptical gap.

The plastic lens assembly can further include an aligning structure,which is for aligning the first plastic lens element and the secondplastic lens element with each other, wherein the optical gap, thecementing glue coating and the aligning structure are far away from acentral axis of the plastic lens assembly along a direction far from thecentral axis in sequence. Therefore, it is favorable for improving thetilting situation of the two cemented plastic lens elements andachieving the sealed effect so as to improve the overflow situation ofthe material of the cementing glue coating.

Each of the aforementioned features of the plastic lens assembly can beutilized in various combinations for achieving the correspondingeffects.

The present disclosure further provides an imaging lens module,including the aforementioned plastic lens assembly. Accordingly, abetter light gathering resolution can be provided for the specific fieldof view.

The present disclosure further provides an electronic device, includingthe aforementioned imaging lens module. Accordingly, an electronicdevice having the better imaging quality is provided.

1st Embodiment

FIG. 1A is a schematic view of an imaging lens module 100 according tothe 1st embodiment of the present disclosure. The imaging lens module100 includes a plastic lens assembly (its reference numeral is omitted)and an image sensor 195, wherein the plastic lens assembly includes abarrel 101, a plurality of lens elements and an image surface 190, thelens elements are disposed in the barrel 101, the image surface 190 isdisposed on an image side of the barrel 101, and the image sensor 195 isdisposed on the image surface 190.

In detail, the plastic lens elements are, in order from the object sideto the image side, a first lens element 110, a second lens element 120,a first plastic lens element 130, a second plastic lens element 140, afifth lens element 150, a first plastic lens element 160 and a secondplastic lens element 170, wherein the plastic lens assembly includes atleast two plastic lens elements, and in the 1st embodiment, the numberof the plastic lens elements is four, which are the two first plasticlens elements 110, 160 and the two second plastic lens elements 120,170.

The first plastic lens element 130 has a first optical effective portion(its reference numeral is omitted) and a first peripheral portion (itsreference numeral is omitted), wherein the first peripheral portionsurrounds the first optical effective portion. The second plastic lenselement 140 has a second optical effective portion (its referencenumeral is omitted) and a second peripheral portion (its referencenumeral is omitted), wherein the second peripheral portion surrounds thesecond optical effective portion. The imaging lens module 100 includes acementing glue coating 102 a, which is disposed between the firstoptical effective portion and the second optical effective portion, andfor cementing the first plastic lens element 130 and the second plasticlens element 140, wherein an optical gap 103 a is formed between thefirst optical effective portion and the second optical effectiveportion, the cementing glue coating 102 a is farther from a center ofthe first optical effective portion than the optical gap 103 a istherefrom. Moreover, the plastic lens assembly can further include analigning structure 106 for aligning the first plastic lens element 130and the second plastic lens element 140 with each other, wherein theoptical gap 103 a, the cementing glue coating 102 a and the aligningstructure 106 are far away from a central axis of the plastic lensassembly along a direction far from the central axis in sequence. In the1st embodiment, the aligning structure 106 includes two surfacestructures (its reference numeral is omitted) on the first plastic lenselement 130 and the second plastic lens element 140, respectively, andthe present disclosure will not be limited thereto.

The first plastic lens element 160 has a first optical effective portion(its reference numeral is omitted) and a first peripheral portion (itsreference numeral is omitted), wherein the first peripheral portionsurrounds the first optical effective portion. The second plastic lenselement 170 has a second optical effective portion (its referencenumeral is omitted) and a second peripheral portion (its referencenumeral is omitted), wherein the second peripheral portion surrounds thesecond optical effective portion. The imaging lens module 100 includes acementing glue coating 102 b, which is disposed between the firstoptical effective portion and the second optical effective portion, andfor cementing the first plastic lens element 160 and the second plasticlens element 170, wherein an optical gap 103 b is formed between thefirst optical effective portion and the second optical effectiveportion, the cementing glue coating 102 b is farther from a center ofthe first optical effective portion than the optical gap 103 b istherefrom.

In detail, the optical gaps 103 a, 103 b are air gaps, which isgradually reduced from a position close to a center region thereof to aperipheral region thereof, respectively. Both of two surfaces of thecementing glue coating 102 a, 102 b are aspheric. Both of two surfacesof the optical gap 103 a, 103 b are aspheric.

In the 1st embodiment, when a refractive index of the optical gap 103 a,103 b is Na, a refractive index of the cementing glue coating 102 a, 102b is Ng, the following condition is satisfied: 0.52<Na/Ng<1.0. Indetail, the refractive index of the optical gap 103 a Na is 1, therefractive index of the cementing glue coating 102 a Ng is 1.485,Na/Ng=0.673; the refractive index of the optical gap 103 b Na is 1, therefractive index of the cementing glue coating 102 b Ng is 1.485, andNa/Ng=0.673. Furthermore, each refractive index of the first plasticlens element 130, 160 is N1, the values are 1.669, 1.669, respectively,and both satisfy the condition, Na/Ng<Na<N1/Na.

FIG. 1B and FIG. 10 are schematic views of the parameters of the imaginglens module 100 according to the 1st embodiment in FIG. 1A,respectively. As shown in FIG. 1B and FIG. 10, when a width of theoptical gap 103 a close to the central axis of the plastic lens assemblyis d, a maximum width of the optical gap 103 a close to the cementingglue coating 102 a is ET, a maximum width of the cementing glue coating102 a farthest from the optical gap 103 a is ETT, a central width of thecementing glue coating 102 a is ETM, a vertical distance between aposition of the optical gap 103 a farthest from the central axis and thecentral axis is Yet, a maximum radius of the optical effective portionof the first plastic lens element 130 facing to the cementing gluecoating 102 a is Y12, and a maximum radius of the optical effectiveportion of the second plastic lens element 140 facing to the cementingglue coating 102 a is Y21, the data in the following Table 1A aresatisfied.

TABLE 1A 1st Embodiment d (mm) 0.1760 Yet (mm) 2.0000 ET (mm) 0.0297 Y12(mm) 2.4237 ET/d 0.1688 Y21 (mm) 2.5078 ETM (mm) 0.0361 Yet/Y12 0.8252ETT (mm) 0.0295 Yet/Y21 0.7975 ETT/ETM 0.8171

As shown in FIG. 1B and FIG. 10, which are schematic views of theparameters of the imaging lens module 100 according to the 1stembodiment in FIG. 1A. When a width of the optical gap 103 b close tothe central axis of the plastic lens assembly is d, a maximum width ofthe optical gap 103 b close to the cementing glue coating 102 b is ET, amaximum width of the cementing glue coating 102 b farthest from theoptical gap 103 b is ETT, a central width of the cementing glue coating102 b is ETM, a vertical distance between a position of the optical gap103 b farthest from the central axis and the central axis is Yet, amaximum radius of the optical effective portion of the first plasticlens element 160 facing to the cementing glue coating 102 b is Y12, anda maximum radius of the optical effective portion of the second plasticlens element 170 facing to the cementing glue coating 102 b is Y21, thedata in the following Table 1B are satisfied.

TABLE 1B 1st Embodiment d (mm) 0.3230 Yet (mm) 2.6606 ET (mm) 0.0162 Y12(mm) 4.3597 ET/d 0.0502 Y21 (mm) 4.3797 ETM (mm) 0.0686 Yet/Y12 0.6103ETT (mm) 0.0157 Yet/Y21 0.6075 ETT/ETM 0.2289

2nd Embodiment

FIG. 2A is a schematic view of an imaging lens module 200 according tothe 2nd embodiment of the present disclosure. The imaging lens module200 includes a plastic lens assembly (its reference numeral is omitted)and an image sensor 295, wherein the plastic lens assembly includes abarrel 201, a plurality of lens elements, a filter 285 and an imagesurface 290, the lens elements are disposed in the barrel 201, the imagesurface 290 is disposed on an image side of the barrel 201, and theimage sensor 295 is disposed on the image surface 290.

In detail, the lens elements are, in order from the object side to theimage side, a first lens element 210, a second lens element 220, a thirdlens element 230, a fourth lens element 240, a fifth lens element 250, asixth lens element 260, a seventh lens element 270 and an eighth lenselement 280, wherein the plastic lens assembly includes at least twoplastic lens elements, and in the 2nd embodiment, the number of theplastic lens element is 8, wherein the seventh lens element 270 isdefined as the first plastic lens element, and the eighth lens element280 is defined as the second plastic lens element. Furthermore, theplastic lens assembly further includes an aperture stop 202 and a stop203, wherein the aperture stop 202 is disposed between the first lenselement 210 and the second lens element 220, and the stop 203 isdisposed between the third lens element 230 and the fourth lens element240.

The first plastic lens element (which is the seventh lens element 270)has a first optical effective portion (its reference numeral is omitted)and a first peripheral portion (its reference numeral is omitted),wherein the first peripheral portion surrounds the first opticaleffective portion. The second plastic lens element (which is the eighthlens element 280) has a second optical effective portion (its referencenumeral is omitted) and a second peripheral portion (its referencenumeral is omitted), wherein the second peripheral portion surrounds thesecond optical effective portion. The imaging lens module 200 includes acementing glue coating 204, which is disposed between the first opticaleffective portion and the second optical effective portion, and forcementing the first plastic lens element and the second plastic lenselement, wherein an optical gap 205 is formed between the first opticaleffective portion and the second optical effective portion, thecementing glue coating 204 is farther from a center of the first opticaleffective portion than the optical gap 205 is therefrom. As shown inFIG. 2A, a light path L11 shows the imaging light which does not passthrough the cementing glue coating 204, a light path L12 shows theimaging light which passes through the cementing glue coating 204, and alight path L13 shows the imaging light which passes through the opticalgap 205. Therefore, the converging situation of the imaging light fromfarther field of view can be adjusted by the arrangement of thecementing glue coating 204 without affecting the light gathering qualityof the central field of view.

In detail, the optical gap 205 is an air gap, which is gradually reducedfrom a position close to a center region thereof to a peripheral regionthereof. Both of two surfaces of the cementing glue coating 204 areaspheric. Both of two surfaces of the optical gap 205 are aspheric.

In the 2nd embodiment, when a refractive index of the optical gap 205 isNa, and a refractive index of the cementing glue coating 204 is Ng, thefollowing condition is satisfied: 0.52<Na/Ng<1.0. In detail, therefractive index of the optical gap 205 Na is 1, the refractive index ofthe cementing glue coating 204 Ng is 1.485, and Na/Ng is 0.673.Furthermore, a refractive index of the first plastic lens element (whichis the seventh lens element 270) is N1, and the value is 1.544, whichsatisfies the condition, Na/Ng<Na<N1/Na.

FIG. 2B and FIG. 2C are schematic views of the parameters of the imaginglens module 200 according to the 2nd embodiment in FIG. 2A,respectively. As shown in FIG. 2B and FIG. 2C, when a width of theoptical gap 205 close to the central axis of the plastic lens assemblyis d, a maximum width of the optical gap 205 close to the cementing gluecoating 204 is ET, a maximum width of the cementing glue coating 204farthest from the optical gap 205 is ETT, a central width of thecementing glue coating 204 is ETM, a vertical distance between aposition of the optical gap 205 farthest from the central axis and thecentral axis is Yet, a maximum radius of the optical effective portionof the first plastic lens element (that is, the seventh lens element270) facing to the cementing glue coating 204 is Y12, and a maximumradius of the optical effective portion of the second plastic lenselement (that is, the eighth lens element 280) facing to the cementingglue coating 204 is Y21, the data in the following Table 2A aresatisfied.

TABLE 2A 2nd Embodiment d (mm) 0.3880 Yet (mm) 2.4000 ET (mm) 0.0238 Y12(mm) 5.1290 ET/d 0.0613 Y21 (mm) 5.2812 ETM (mm) 0.0227 Yet/Y12 0.4679ETT (mm) 0.0301 Yet/Y21 0.4544 ETT/ETM 1.3260

Furthermore, the detailed optical data of the 2nd embodiment are shownin Table 2B and the aspheric surface data are shown in Table 2C below.

TABLE 2B 2nd Embodiment f = 3.94 mm, Fno = 1.60, HFOV = 38.6 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 1.928 ASP 0.525 Plastic 1.545 56.0 7.10 23.478 ASP 0.081 3 Ape. Stop Plano 0.068 4 Lens 2 2.506 ASP 0.200 Plastic1.671 19.5 −10.52 5 1.790 ASP 0.116 6 Lens 3 1.963 ASP 0.446 Plastic1.544 56.0 5.36 7 5.527 ASP 0.056 8 Stop Plano 0.354 9 Lens 4 186.578ASP 0.262 Plastic 1.671 19.5 −14.96 10 9.516 ASP 0.118 11 Lens 5 −4.540ASP 0.584 Plastic 1.544 56.0 4.24 12 −1.600 ASP 0.080 13 Lens 6 4.352ASP 0.345 Plastic 1.671 19.5 −8.65 14 2.408 ASP 0.412 15 Lens 7 1.619ASP 0.346 Plastic 1.544 56.0 20.86 16 1.746 ASP 0.388 Partial-cemented17 Lens 8 −2.844 ASP 0.369 Plastic 1.535 55.8 −4.56 18 17.810 ASP 0.23019 Filter Plano 0.100 Glass 1.517 64.2 — 20 Plano 0.107 21 Image Plano —Reference wavelength is 587.6 nm (d-line). Effective radius of surface 8(stop) is 1.200 mm. Surface 16 is a partial-cemented surface at Y =1.200 − 2.30 (which has Index = 1:485, Abbe # = 53.2)

TABLE 2C Aspheric Coefficients Surface 1 2 4 5 6 7 k= −7.5558E−02  1.8388E−01 −2.6199E+01 −1.2691E+01 −7.7466E+00 7.7477E+00 A4=1.9730E−03 −5.9360E−02 −6.8861E−03 −1.7037E−02 −9.3162E−03 −3.1641E−02 A6= −1.5553E−02   3.7091E−02  4.0560E−03  7.8752E−02  7.6992E−029.5138E−04 A8= 5.9626E−03 −7.6079E−02 −4.7529E−02 −1.5539E−01−1.5110E−01 −1.1970E−02  A10= 2.7832E−03  4.5418E−02  3.8138E−02 1.4312E−01  1.3120E−01 1.3892E−03 A12= −9.8246E−03  −9.5835E−03 5.1832E−03 −5.8462E−02 −8.1055E−02 −1.3668E−02  A14= 2.6039E−03−5.6365E−03  1.1309E−02  2.4939E−02 6.9141E−03 Surface 9 10 11 12 13 14k=  9.0000E+01  4.6461E+01 8.9348E+00 −1.4561E+00 2.4347E+00 −6.0993E+00A4= −2.2585E−01 −3.3182E−01 −2.1600E−01   1.6542E−01 1.1748E−01−6.9686E−02 A6=  3.4023E−01  9.4694E−01 1.2471E+00 −1.4906E−01−2.5447E−01   7.9880E−02 A8= −8.9321E−01 −2.0248E+00 −2.6063E+00  3.8163E−02 2.6251E−01 −8.2540E−02 A10=  1.2667E+00  2.2813E+002.8342E+00  1.8765E−02 −2.1190E−01   3.8046E−02 A12= −9.2388E−01−1.3710E+00 −1.7268E+00  −1.5067E−02 1.1213E−01 −8.7322E−03 A14= 3.1985E−01  4.1316E−01 5.8535E−01  4.5369E−03 −3.5496E−02   9.0885E−04A16= −4.0070E−02 −4.8397E−02 −1.0137E−01  −6.0201E−04 5.9114E−03−2.7497E−05 A18= −1.5452E−04 6.8673E−03 −3.8549E−04  Surface 15 16 17 18k= −4.1418E+00 −3.2044E+00 −1.4099E+01 −6.9116E+01 A4= −1.3863E−01−1.9790E−01 −3.3084E−01 −2.0709E−01 A6=  7.9691E−02  1.6085E−01 5.0767E−01  2.5648E−01 A8= −1.6087E−01 −1.9432E−01 −3.9883E−01−1.4720E−01 A10=  1.3947E−01  1.4107E−01  1.8861E−01  4.7769E−02 A12=−6.0268E−02 −5.5445E−02 −5.5035E−02 −9.5115E−03 A14=  1.4826E−02 1.2492E−02  9.9004E−03  1.1905E−03 A16= −2.1253E−03 −1.6295E−03−1.0681E−03 −9.1817E−05 A18=  1.6577E−04  1.1495E−04  6.3408E−05 4.0079E−06 A20= −5.4420E−06 −3.4029E−06 −1.5944E−06 −7.6158E−08

In Table 2B shows the detailed optical data according to the 2ndembodiment of FIG. 2A, the curvature radius, the thickness and the focallength are shown in millimeters (mm). Surface numbers 0-21 represent thesurfaces sequentially arranged from the object side to the image sidealong the optical axis. In Table 2C, k represents the conic coefficientof the equation of the aspheric surface profiles. A4-A20 represent theaspheric coefficients ranging from the 4th order to the 20th order. Thetables presented below for the 3rd embodiment correspond to schematicparameter and aberration curves of each embodiment, and term definitionsof the tables are the same as those in Table 2B and Table 2C of the 2ndembodiment. Therefore, an explanation in this regard will not beprovided again.

3rd Embodiment

FIG. 3A is a schematic view of an imaging lens module 300 according tothe 3rd embodiment of the present disclosure. The imaging lens module300 includes a plastic lens assembly (its reference numeral is omitted)and an image sensor 395, wherein the plastic lens assembly includes abarrel 301, a plurality of lens elements, a filter 385 and an imagesurface 390, the lens elements are disposed in the barrel 301, the imagesurface 390 is disposed on an image side of the barrel 301, and theimage sensor 395 is disposed on the image surface 390.

In detail, the lens elements are, in order from the object side to theimage side, a first lens element 310, a second lens element 320, a thirdlens element 330, a fourth lens element 340, a fifth lens element 350, asixth lens element 360, and a seventh lens element 370, wherein theplastic lens assembly includes at least two plastic lens elements, andin the 3rd embodiment, the number of the plastic lens element is 8,wherein the third lens element 330 is defined as the first plastic lenselement, and the fourth lens element 340 is defined as the secondplastic lens element. Furthermore, the plastic lens assembly furtherincludes an aperture stop 302, wherein the aperture stop 302 is disposedbetween the first lens element 310 and the second lens element 320.

The first plastic lens element (that is, the third lens element 330) hasa first optical effective portion (its reference numeral is omitted) anda first peripheral portion (its reference numeral is omitted), whereinthe first peripheral portion surrounds the first optical effectiveportion. The second plastic lens element (that is, the fourth lenselement 340) has a second optical effective portion (its referencenumeral is omitted) and a second peripheral portion (its referencenumeral is omitted), wherein the second peripheral portion surrounds thesecond optical effective portion. The imaging lens module 300 includes acementing glue coating 304, which is disposed between the first opticaleffective portion and the second optical effective portion, and forcementing the first plastic lens element and the second plastic lenselement, wherein an optical gap 305 is formed between the first opticaleffective portion and the second optical effective portion, thecementing glue coating 304 is farther from a center of the first opticaleffective portion than the optical gap 305 is therefrom. As shown inFIG. 3A, a light path L12 shows the imaging light which passes throughthe cementing glue coating 304, and a light path L13 shows the imaginglight which passes through the optical gap 305. Therefore, theconverging situation of the imaging light from farther field of view canbe adjusted by the arrangement of the cementing glue coating 304 withoutaffecting the light gathering quality of the central field of view.

In detail, the optical gap 305 is an air gap, which is gradually reducedfrom a position close to a center region thereof to a peripheral regionthereof. Both of two surfaces of the cementing glue coating 304 areaspheric. Both of two surfaces of the optical gap 305 are aspheric.

Moreover, the plastic lens assembly can further include an aligningstructure 306 for aligning the first plastic lens element and the secondplastic lens element with each other, wherein the optical gap 305, thecementing glue coating 304 and the aligning structure 306 are far awayfrom a central axis of the plastic lens assembly along a direction farfrom the central axis in sequence. In the 3rd embodiment, the aligningstructure 306 includes two surface structures (its reference numeral isomitted) on the first plastic lens element and the second plastic lenselement, respectively, and the present disclosure will not be limitedthereto.

In the 3rd embodiment, when a refractive index of the optical gap 305 isNa, and a refractive index of the cementing glue coating 304 is Ng, thefollowing condition is satisfied: 0.52<Na/Ng<1.0. In detail, therefractive index of the optical gap 305 Na is 1, the refractive index ofthe cementing glue coating 304 Ng is 1.485, and Na/Ng is 0.673.Furthermore, a refractive index of the first plastic lens element (thatis, the third lens element 330) is N1, and the value is 1.669, whichsatisfies the condition, Na/Ng<Na<N1/Na.

FIG. 3B and FIG. 3C are schematic views of the parameters of the imaginglens module 300 according to the 3rd embodiment in FIG. 3A,respectively. As shown in FIG. 3B and FIG. 3C, when a width of theoptical gap 305 close to the central axis of the plastic lens assemblyis d, a maximum width of the optical gap 305 close to the cementing gluecoating 304 is ET, a maximum width of the cementing glue coating 304farthest from the optical gap 305 is ETT, a central width of thecementing glue coating 304 is ETM, a vertical distance between aposition of the optical gap 305 farthest from the central axis and thecentral axis is Yet, a maximum radius of the optical effective portionof the first plastic lens element (that is, the third lens element 330)facing to the cementing glue coating 304 is Y12, and a maximum radius ofthe optical effective portion of the second plastic lens element (thatis, the fourth lens element 340) facing to the cementing glue coating304 is Y21, the data in the following Table 3A are satisfied.

TABLE 3A 3rd Embodiment d (mm) 0.1760 Yet (mm) 2.0000 ET (mm) 0.0297 Y12(mm) 2.4237 ET/d 0.1688 Y21 (mm) 2.5078 ETM (mm) 0.0361 Yet/Y12 0.8252ETT (mm) 0.0295 Yet/Y21 0.7975 ETT/ETM 0.8172

Furthermore, the detailed optical data of the 3rd embodiment are shownin Table 3B and the aspheric surface data are shown in Table 3C below.

TABLE 3B 3rd Embodiment f = 3.90 mm, Fno = 1.85, HFOV = 44.9 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 1.870 ASP 0.395 Plastic 1.545 56.1 8.43 22.917 ASP 0.157 3 Ape. Stop Plano 0.364 4 Lens 2 8.310 ASP 0.501 Plastic1.544 56.0 5.13 5 −4.111 ASP 0.036 6 Lens 3 −11.953 ASP 0.230 Plastic1.669 19.5 −7.89 7 9.527 ASP 0.176 Partial-cemented 8 Lens 4 −14.001 ASP0.259 Plastic 1.614 26.0 −12.51 9 17.107 ASP 0.148 10 Lens 5 −4.745 ASP0.715 Plastic 1.566 37.4 2.18 11 −1.034 ASP 0.050 12 Lens 6 −33.778 ASP0.350 Plastic 1.669 19.5 −5.86 13 4.453 ASP 0.323 14 Lens 7 1.548 ASP0.380 Plastic 1.614 26.0 −4.34 15 0.888 ASP 0.500 16 Filter Plano 0.210Glass 1.517 64.2 — 17 Plano 0.695 18 Image Plano — Reference wavelengthis 587.6 nm (d-line). Effective radius of surface 1 is 1.100 mm.Effective radius of surface 5 is 1.030 mm. Surface 7 is apartial-cemented surface at Y ≥ 1.000 (which has Index = 1.485, Abbe # =53.2) Effective radius of surface 15 is 2.829 mm.

TABLE 3C Aspheric Coefficient Surface 1 2 4 5 6 7 k= −6.3418E−01−3.4237E+00 −5.0668E+01 −3.1188E+01 −2.3409E+01 −9.9000E+01  A4=−7.6189E−03  2.5469E−02 −8.6188E−03  7.2230E−03  9.2689E−02 5.7203E−02A6=  1.0132E−01 −9.7951E−03 −1.3633E−01 −8.7498E−01 −1.2826E+00−3.7118E−01  A8= −1.8030E−01 −3.1281E−02  1.1528E−01  1.9295E+00 2.6985E+00 2.7501E−01 A10=  1.4707E−01 −7.5113E−03 −1.4368E−01−1.8815E+00 −2.3399E+00 1.2980E−02 A12= −5.4890E−02  6.4170E−01 7.0633E−01 −1.4344E−01  A14= 5.3868E−02 Surface 8 9 10 11 12 13 k= 7.6259E+01 9.9000E+01  1.8113E+00 −1.5471E+00 −8.1988E+01 −5.8189E+01A4= −8.3072E−02 −3.4448E−01  −4.2034E−01  1.5306E−01  3.7926E−01 2.2470E−01 A6=  3.9448E−01 1.0686E+00  1.1670E+00 −1.6892E−01−3.4175E−01 −8.8248E−02 A8= −7.3201E−01 −1.6700E+00  −1.6283E+00 1.3803E−01  1.1931E−01 −1.6631E−01 A10= −3.4414E−01 1.1691E+00 1.3193E+00 −2.9879E−01 −2.7492E−02  2.0415E−01 A12=  8.9906E−01−3.6931E−01  −6.1799E−01  3.9985E−01  2.4759E−02 −1.1091E−01 A14=−3.1315E−01 4.2129E−02  1.5286E−01 −2.5576E−01 −2.0659E−02  3.4317E−02A16= −1.5276E−02  8.2627E−02  7.9848E−03 −6.1572E−03 A18= −1.2945E−02−1.4435E−03  5.9485E−04 A20=  7.7865E−04  1.0015E−04 −2.3936E−05 Surface14 15 k= −2.2259E+00 −3.8165E+00 A4= −2.4979E−01 −1.3990E−01 A6= 4.2645E−02  1.3821E−02 A8=  3.5805E−02  2.5087E−02 A10= −2.8988E−02−1.2661E−02 A12=  1.0798E−02  2.8643E−03 A14= −2.3387E−03 −3.6337E−04A16=  2.9595E−04  2.6497E−05 A18= −2.0213E−05 −1.0290E−06 A20= 5.7473E−07  1.6240E−08

4th Embodiment

FIG. 4A is a schematic view of an electronic device 40 according to the4th embodiment of the present disclosure. FIG. 4B is another schematicview of the electronic device 40 of the 4th embodiment. In FIG. 4A andFIG. 4B, the electronic device 40 of the 4th embodiment is a smartphone,the electronic device 40 includes the imaging lens module 41 accordingto the present disclosure, wherein the imaging lens module 41 can be theimaging lens module of any one of the aforementioned embodiments, butwill not be limited thereto. The imaging lens module 41 can include aplastic lens assembly 41 a and an image sensor 42, the image sensor 42is disposed on an image surface (not shown) of the plastic lens assembly41 a. Therefore, it is favorable for satisfying requirements of the massproduction and appearance of the imaging lens module applied to theelectronic device nowaday.

Specifically, the user activates the shooting mode by the user interface48 of the electronic device 40, wherein the user interface of the 4thembodiment can be a touch screen 48 a, a button 48 b, etc. At thismoment, the imaging lens module 41 collects the imaging light on theimage sensor 42 and outputs an electronic signal about the image to anImage Signal Processor (ISP) 47.

FIG. 4C shows a block diagram of the electronic device 40 according tothe 4th embodiment, and particularly a camera block diagram in theelectronic device 40. In FIGS. 4A to 4C, in response to the cameraspecifications of the electronic device 40, the electronic device 40 mayfurther include an optical anti-shake component 44. Furthermore, theelectronic device 40 can further include at least one auxiliary opticalcomponent 46 and at least one sensing component 45. The auxiliaryoptical component 46 can be a flash module that compensates for colortemperature, an infrared ranging component, a laser focusing module,etc. The sensing component 45 can have a function of sensing physicalmomentum and actuation energy, such as an accelerometer, a gyroscope,and a Hall Effect Element to sense the shaking and shaking applied bythe user's hand or the external environment. Further, the autofocusfunction and the optical anti-shake component 44 configured by theimaging lens module 41 in the electronic device 40 are facilitated toobtain good imaging quality, and the electronic device 40 according tothe present disclosure has a plurality of modes of shooting functions,such as optimized self-timer, low light source HDR (High Dynamic Rangeimaging), high resolution 4K (4K Resolution) video. Moreover, the usercan directly view the camera's shooting screen from the touch screen andmanually operate the viewing range on the touch screen to achieve theautofocus function of what you see is what you get.

Furthermore, in FIG. 4B, the imaging lens module 41, the image sensor42, the optical anti-shake mechanism 44, the sensing component 45 andthe auxiliary optical component 46 can be disposed on a Flexible PrintedCircuit Board (FPC) 49 a and electrically connected to the imagingsignal processor 47 through the connector 49 b to execute thephotographing process. The current electronic devices, such as smartphones, have a thin and light trend. The camera module and its imaginglens and related components are arranged on a flexible circuit board,and then the circuit is integrated into the main board of the electronicdevice by using a connector, which can meet the limited space of themechanism design and the circuit layout requirements, and the greatermargin is achieved, and the autofocus function of the imaging lens ismore flexibly controlled by the touch screen of the electronic device.In the 4th embodiment, the electronic device 40 can include a pluralityof the sensing components 45 and a plurality of the auxiliary opticalcomponents 46. The sensing components 45 and the auxiliary opticalcomponents 46 are disposed on the FPC board 49 a and at least one otherFPC board (no label) and electrically connected to the imaging signalprocessor 47 through the corresponding connector to execute thephotographing process. In other embodiments (no view), the sensingelement and the auxiliary optical element can also be disposed on themain board of the electronic device or other forms of the carrieraccording to the mechanism design and the circuit layout requirements.

Furthermore, the electronic device 40 can further include, but is notlimited to, a display unit, a control unit, a storage unit, a RandomAccess Memory unit (RAM), a Read-Only Memory unit (ROM), or acombination thereof.

5th Embodiment

FIG. 5 shows a schematic view of an electronic device 50 according tothe 5th embodiment of the present disclosure. The electronic device 50of the 5th embodiment is a tablet computer. The electronic device 50includes a imaging lens module 51 according to the present disclosure,wherein the imaging lens module 51 includes a plastic lens assembly (notshown) and an image sensor (not shown), the image sensor is disposed onan image surface (not shown) of the plastic lens assembly.

6th Embodiment

FIG. 6 shows a schematic view of an electronic device 60 according tothe 6th embodiment of the present disclosure. The electronic device 60of the 6th embodiment is a wearable device. The electronic device 60includes a imaging lens module 61 according to the present disclosure,wherein the imaging lens module 61 includes a plastic lens assembly (notshown) and an image sensor (not shown), the image sensor is disposed onan image surface (not shown) of the plastic lens assembly.

The foregoing description, for purpose of explanation, has beendescribed with reference to specific embodiments. The embodiments werechosen and described in order to best explain the principles of thedisclosure and its practical applications, to thereby enable othersskilled in the art to best utilize the disclosure and variousembodiments with various modifications as are suited to the particularuse contemplated. The embodiments depicted above and the appendeddrawings are exemplary and are not intended to be exhaustive or to limitthe scope of the present disclosure to the precise forms disclosed. Manymodifications and variations are possible in view of the aboveteachings.

What is claimed is:
 1. A plastic lens assembly, comprising: at least twoplastic lens elements comprising: a first plastic lens element having afirst optical effective portion and a first peripheral portion, whereinthe first peripheral portion surrounds the first optical effectiveportion; and a second plastic lens element having a second opticaleffective portion and a second peripheral portion, wherein the secondperipheral portion surrounds the second optical effective portion; andat least one cementing glue coating disposed between the first opticaleffective portion and the second optical effective portion, wherein atleast one optical gap is formed between the first optical effectiveportion and the second optical effective portion, the cementing gluecoating is farther from a center of the first optical effective portionthan the optical gap is therefrom, the at least one cementing gluecoating is located between the first optical effective portion of thefirst plastic lens element and the second optical effective portion ofthe second plastic lens element along a direction parallel to a centralaxis of the plastic assembly, and the at least one optical gap islocated between the first optical effective portion of the first plasticlens element and the second optical effective portion of the secondplastic lens element along the direction parallel to the central axis ofthe plastic assembly; wherein a refractive index of the optical gap isNa, a refractive index of the cementing glue coating is Ng, and thefollowing condition is satisfied:0.52<Na/Ng<1.0.
 2. The plastic lens assembly of claim 1, wherein theoptical gap is an air gap.
 3. The plastic lens assembly of claim 2,wherein the refractive index of the optical gap is Na, the refractiveindex of the cementing glue coating is Ng, a refractive index of thefirst plastic lens element is N1, and the following condition issatisfied:Na/Ng<Na<N1/Na.
 4. The plastic lens assembly of claim 2, wherein twosurfaces of the cementing glue coating are aspheric.
 5. The plastic lensassembly of claim 2, wherein two surfaces of the optical gap areaspheric.
 6. The plastic lens assembly of claim 2, further comprising:an aligning structure for aligning the first plastic lens element andthe second plastic lens element with each other, wherein the opticalgap, the cementing glue coating and the aligning structure are far awayfrom a central axis of the plastic lens assembly along a direction farfrom the central axis in sequence.
 7. The plastic lens assembly of claim2, wherein a width of the optical gap close to a central axis of theplastic lens assembly is d, a maximum width of the optical gap close tothe cementing glue coating is ET, and the following condition issatisfied:0<ET/d<0.90.
 8. The plastic lens assembly of claim 7, wherein the widthof the optical gap close to the central axis of the plastic lensassembly is d, the maximum width of the optical gap close to thecementing glue coating is ET, and the following condition is satisfied:0<ET/d<0.40.
 9. The plastic lens assembly of claim 7, wherein a maximumwidth of the cementing glue coating farthest from the optical gap isETT, a central width of the cementing glue coating is ETM, and thefollowing condition is satisfied:0.1<ETT/ETM<1.5.
 10. The plastic lens assembly of claim 7, wherein themaximum width of the optical gap close to the cementing glue coating isET, a central width of the cementing glue coating is ETM, and thefollowing condition is satisfied:0.1<ET/ETM<1.5.
 11. The plastic lens assembly of claim 10, wherein themaximum width of the optical gap close to the cementing glue coating isET, the central width of the cementing glue coating is ETM, and thefollowing condition is satisfied:0.1<ET/ETM<1.0.
 12. The plastic lens assembly of claim 11, wherein theoptical gap is gradually reduced from a position close to a centerregion thereof to a peripheral region thereof.
 13. The plastic lensassembly of claim 7, wherein a vertical distance between a position ofthe optical gap farthest from the central axis and the central axis isYet, a maximum radius of the optical effective portion of the firstplastic lens element facing to the cementing glue coating is Y12, andthe following condition is satisfied:Yet/Y12<0.95.
 14. The plastic lens assembly of claim 13, wherein thevertical distance between the position of the optical gap farthest fromthe central axis and the central axis is Yet, the maximum radius of theoptical effective portion of the first plastic lens element facing tothe cementing glue coating is Y12, and the following condition issatisfied:Yet/Y12<0.85.
 15. The plastic lens assembly of claim 7, wherein avertical distance between a position of the optical gap farthest fromthe central axis and the central axis is Yet, a maximum radius of theoptical effective portion of the second plastic lens element facing tothe cementing glue coating is Y21, and the following condition issatisfied:Yet/Y21<0.95.
 16. The plastic lens assembly of claim 15, wherein thevertical distance between the position of the optical gap farthest fromthe central axis and the central axis is Yet, the maximum radius of theoptical effective portion of the second plastic lens element facing tothe cementing glue coating is Y21, and the following condition issatisfied:Yet/Y21<0.85.
 17. The plastic lens assembly of claim 1, wherein acentral thickness of the cementing glue coating is ETM, and thefollowing condition is satisfied:0.02 mm<ETM<0.12 mm.
 18. The plastic lens assembly of claim 1, whereinthe refractive index of the optical gap is Na, the refractive index ofthe cementing glue coating is Ng, and the following condition issatisfied:0.56<Na/Ng<0.80.
 19. An imaging lens module, comprising: the plasticlens assembly of claim
 1. 20. An electronic device, comprising: theimaging lens module of claim 19.